package onjava.generics;


// generics/FilledList.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;
import java.util.function.*;
import onjava.*;

/**
 * 
 * 类型擦除的奥秘 -> 边界的行为
 *
 * @author Lucky Yang
 */
public class FilledList<T> extends ArrayList<T> {
  FilledList(Supplier<T> gen, int size) {
    Suppliers.fill(this, gen, size);
  }

  public FilledList(T t, int size) {
    for (int i = 0; i < size; i++) {
      this.add(t);
    }
  }

  public static void main(String[] args) {
    List<String> list = new FilledList<>("Hello", 4);
    System.out.println(list);
    // Supplier version:
    List<Integer> ilist = new FilledList<>(() -> 47, 4);
    System.out.println(ilist);
  }
}
/*
 * Output:
 * [Hello, Hello, Hello, Hello]
 * [47, 47, 47, 47]
 */
